
pH paper is good enough. Pretty accurate and good solid case/dispenser. When I first used it I thought it wouldn't work because the strips don't change color when placed in known acidic or alkaline solutions. It turns out that the first few inches of the opened strip were probably exposed to the air for too long during storage etc. No problems after that and fairly accurate pH results.

Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
7 Review

π PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review

TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review

Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review